<source_location>: Use __builtin_FUNCSIG when Clang 17 is available #3729
Description
I've implemented __builtin_FUNCSIG in Clang recently (llvm/llvm-project@78d8312):
const char* __builtin_FUNCSIG();We should use this builtin in source_location implementation after VS gets Clang 17:
Lines 28 to 32 in a621095
Comparison:
// https://godbolt.org/z/zq6v9v87q
#include <iostream>
void f(const char* old_ = __builtin_FUNCTION(), const char* new_ = __builtin_FUNCSIG()) {
std::cout << "old: " << old_ << "\nnew: " << new_ << '\n';
}
int main() {
f();
}old: main
new: int __cdecl main(void)